code: def call(self, inputs):
      return tf.expand_dims(inputs, axis=-1)
  
imports: from typing import List
  import tensorflow
  from tensorflow import keras
  from tensorflow import nest
  from tensorflow.keras import layers
  from tensorflow.keras.layers.experimental import preprocessing
  from autokeras.utils import data_utils
label_desc: Use image node_id 2 for calling the ExpandLastDim obj's underlying member method code with example usage: obj.call(inputs) and returns: tf